McFarlane Halo 4 Series 1 offers fans a look at some of the characters from the new game. Halo 4 marks the return of the most popular character of the Halo universe, the Master Chief! He was last seen at the end of Halo 3 entering into a cryonic sleep and telling Cortana to "wake me, when you need me. Halo 4 begins with the Master Chief waking up ready to face new threats and mysteries.